Abstract:
:Visual contours often result from the integration or interpolation of fragmented edges. The strength of the completion increases when the edges share the same contrast polarity (CP). Here we demonstrate that the appearance in the perceptual field of this integrated unit, or contour of invariant CP, is concomitant with a vivid brightness alteration of the surfaces at its opposite sides. To observe this effect requires some stratagems because the formation in the visual field of a contour of invariant CP normally engenders the formation of a second contour and then the rise of two streams of induction signals that interfere in different ways. Particular configurations have been introduced that allow us to observe the induction effects of one contour taken in isolation. I documented these effects by phenomenological observations and psychophysical measurement of the brightness alteration in relation to luminance contrast. When the edges of the same CP complete to form a contour, the background of homogeneous luminance appears to dim at one side and to brighten at the opposite side (in accord with the CP). The strength of the phenomenon is proportional to the local luminance contrast. This effect weakens or nulls when the contour of the invariant CP separates surfaces filled with different gray shades. These conflicting results stimulate a deeper exploration of the induction phenomena and their role in the computation of brightness contrast. An alternative perspective is offered to account for some brightness illusions and their relation to the phenomenal transparency. The main assumption asserts that, when in the same region induction signals of opposite CP overlap, the filling-in is blocked unless the image is stratified into different layers, one for each signal of the same polarity. Phenomenological observations document this "solution" by the visual system.
journal_name
Front Hum Neuroscijournal_title
Frontiers in human neuroscienceauthors
Roncato Sdoi
10.3389/fnhum.2014.00841subject
Has Abstractpub_date
2014-10-20 00:00:00pages
841issn
1662-5161journal_volume
8pub_type
杂志文章abstract::Gait initiation (GI) involves passing from bipedal to unipedal stance. It requires a rapid movement of the center of foot pressure (CoP) towards the future swing foot and of the center of mass (CoM) in the direction of the stance foot prior to the incoming step. This anticipatory postural adjustment (APA) allows disen...
journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
doi:10.3389/fnhum.2016.00445
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
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journal_title:Frontiers in human neuroscience
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
doi:10.3389/fnhum.2015.00389
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章,评审
doi:10.3389/fnhum.2015.00057
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
doi:10.3389/fnhum.2014.00757
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
doi:10.3389/fnhum.2013.00649
更新日期:2013-11-11 00:00:00
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
doi:10.3389/fnhum.2018.00360
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章,评审
doi:10.3389/fnhum.2013.00801
更新日期:2013-11-28 00:00:00
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
doi:10.3389/fnhum.2014.00030
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
doi:10.3389/fnhum.2019.00193
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
doi:10.3389/fnhum.2013.00055
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journal_title:Frontiers in human neuroscience
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doi:10.3389/fnhum.2015.00407
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
doi:10.3389/fnhum.2016.00551
更新日期:2016-11-08 00:00:00
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
doi:10.3389/fnhum.2014.00396
更新日期:2014-06-27 00:00:00
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
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journal_title:Frontiers in human neuroscience
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
doi:10.3389/fnhum.2017.00350
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journal_title:Frontiers in human neuroscience
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
doi:10.3389/fnhum.2012.00234
更新日期:2012-08-14 00:00:00
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
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journal_title:Frontiers in human neuroscience
pub_type: 杂志文章
doi:10.3389/fnhum.2019.00099
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